Read by QxMD icon Read

distal convoluted tubule

Andreas Kompatscher, J H F de Baaij, Karam Aboudehen, Shayan Farahani, Lex H J Van Son, Susanne Milatz, Nina Himmerkus, Gert Jan C Veenstra, René J M Bindels, Joost G J Hoenderop
Mutations in HNF1β cause autosomal dominant tubulointerstitial kidney disease (ADTKD-HNF1β), and patients tend to develop renal cysts, maturity-onset diabetes of the young (MODY), and suffer from electrolyte disturbances, including hypomagnesemia, hypokalemia and hypocalciuria. Previous HNF1β research focused on the renal distal convoluted tubule (DCT) to elucidate the ADTKD-HNF1β electrolyte phenotype, although 70% of Mg2+ is reabsorbed in the thick ascending limb of Henle's loop (TAL). An important regulator of Mg2+ reabsorption in the TAL is the calcium-sensing receptor (CaSR)...
March 21, 2018: American Journal of Physiology. Renal Physiology
Ahmed E Noreldin, Yaser Hosny Ali Elewa, Yasuhiro Kon, Katsuhiko Warita, Yoshinao Z Hosaka
Osteoblast activating peptide (OBAP) is a newly discovered peptide detected in the rat stomach, which has a major role in osteogenesis. Recently, we revealed its localization in the parietal cells of the rat stomach. There have been no data regarding OBAP expression in the kidney, despite its role in calcium reabsorption in renal tubules. The current study aimed to inspect the expression of OBAP in the kidney of twelve 10-week-old male C3H/HeNJc1 mice using immunohistochemistry, and immunoelectron microscopic localization...
March 10, 2018: Acta Histochemica
Søren Brandt Poulsen, Kavee Limbutara, Robert Andrew Fenton, Trairak Pisitkun, Birgitte M Christensen
The renal aldosterone-sensitive distal tubule (ASDT) is crucial for sodium reabsorption and blood pressure regulation. The ASDT consists of the late distal convoluted tubule (DCT2), connecting tubule (CNT) and collecting duct. Due to difficulties in isolating epithelial cells from the ASDT in large quantities, few transcriptome studies have been performed on this segment. Moreover, no studies exist on isolated DCT2 and CNT cells (excluding intercalated cells), and the role of aldosterone for regulating the transcriptome of these specific cell types is largely unknown...
March 9, 2018: Physiological Genomics
Ivana Kristina Delic Jukic, Sandra Kostic, Natalija Filipovic, Larissa Gudelj Ensor, Marijeta Ivandic, Josefina Josipa Dukic, Marija Vitlov Uljevic, Lejla Ferhatovic Hamzic, Livia Puljak, Katarina Vukojevic
Background: Diabetic nephropathy (DN) is a common complication of diabetes mellitus (DM). We studied the expression of special AT-rich sequence binding protein 1 (SATB1) and phosphatase and tensin homologue (PTEN) in the kidneys of diabetic rats during ageing. Methods: Male Sprague Dawley rats were injected with 55 mg/kg streptozotocin (STZ) (DM group) or with citrate buffer (control group). Kidneys were collected after 2 weeks, 6 months and 12 months, and were analysed in three different kidney structures: glomeruli, proximal (PCT) and distal convoluted tubules (DCT)...
March 1, 2018: Nephrology, Dialysis, Transplantation
Peng Wu, Zhong-Xiuzi Gao, Xin-Peng Duan, Xiao-Tong Su, Ming-Xiao Wang, Dao-Hong Lin, Ruimin Gu, Wen-Hui Wang
AT2R (AngII [angiotensin II] type 2 receptor) is expressed in the distal nephrons. The aim of the present study is to examine whether AT2R regulates NCC (Na-Cl cotransporter) and Kir4.1 of the distal convoluted tubule. AngII inhibited the basolateral 40 pS K channel (a Kir4.1/5.1 heterotetramer) in the distal convoluted tubule treated with losartan but not with PD123319. AT2R agonist also inhibits the K channel, indicating that AT2R was involved in tonic regulation of Kir4.1. The infusion of PD123319 stimulated the expression of tNCC (total NCC) and pNCC (phosphorylated NCC; Thr53 ) by a time-dependent way with the peak at 4 days...
February 26, 2018: Hypertension
Autumn N Harris, P Richard Grimm, Hyun-Wook Lee, Eric Delpire, Lijuan Fang, Jill W Verlander, Paul A Welling, I David Weiner
Background Hyperkalemia in association with metabolic acidosis that are out of proportion to changes in glomerular filtration rate defines type 4 renal tubular acidosis (RTA), the most common RTA observed, but the molecular mechanisms underlying the associated metabolic acidosis are incompletely understood. We sought to determine whether hyperkalemia directly causes metabolic acidosis and, if so, the mechanisms through which this occurs. Methods We studied a genetic model of hyperkalemia that results from early distal convoluted tubule (DCT)-specific overexpression of constitutively active Ste20/SPS1-related proline-alanine-rich kinase (DCT-CA-SPAK)...
February 26, 2018: Journal of the American Society of Nephrology: JASN
Andrew Scott Terker, Maria Castaneda-Bueno, Mohammed Zubaerul Ferdaus, Ryan J Cornelius, Kayla J Erspamer, Xiao-Tong Su, Lauren N Miller, James A McCormick, Wen-Hui Wang, Gerardo Gamba, Chao-Ling Yang, David H Ellison
With no lysine kinase 4 (WNK4) is essential to activate the thiazide-sensitive NaCl cotransporter (NCC) along the distal convoluted tubule, an effect central to the phenotype of familial hyperkalemic hypertension. Although effects on potassium and sodium channels along the connecting and collecting tubules have also been documented, WNK4 is typically believed to have little role in modulating sodium chloride reabsorption along the thick ascending limb of the loop of Henle. Yet wnk4-/- mice (knockout mice lacking WNK4) do not demonstrate the hypocalciuria typical of pure distal convoluted tubule dysfunction...
February 7, 2018: American Journal of Physiology. Renal Physiology
Olivier J M Schäffers, Joost G J Hoenderop, René J M Bindels, J H F de Baaij
Body Mg2+ balance is finely regulated in the distal convoluted tubule (DCT), where a tight interplay between transcellular reabsorption, mitochondrial exchange and basolateral extrusion takes place. In the last decades, several research groups have aimed to identify the molecular players in these processes. A multitude of proteins have been proposed to function as Mg2+ transporter in eukaryotes based on phylogenetic analysis, differential gene expression and overexpression studies. However, functional evidence for many of these proteins is lacking...
February 7, 2018: American Journal of Physiology. Renal Physiology
Mao Zheng, Shandong Ye, Yan Chen, Meinan Chen
AIM: To study the excretion of urinary Tamm-Horsfall protein (THP) with a wide range of urinary albumin creatinine ratio (UACR) and estimated glomerular filtration rate (eGFR) in a population with type 2 diabetes mellitus (T2DM). MATERIALS AND METHODS: A retrospective investigation was performed in 3,599 adult inpatients with T2DM in Anhui Provincial Hospital of China. Demographic information, urinary THP data, and other lab reports were obtained from the Electronic Patient Record (EPR)...
February 2, 2018: Clinical Nephrology
Keiya Nagasawa, Kasane Imura-Kishi, Aya Uchida, Ryuji Hiramatsu, Masamichi Kurohmaru, Yoshiakira Kanai
In mouse testes, Sertoli cells support the continuous process of spermatogenesis, which is dependent on seminiferous epithelial cycles along the longitudinal axis of the seminiferous tubule. Sertoli cell function is modulated partly by local cytokines and/or growth factors derived from adjacent tissues such as blood vessels, macrophages, rete testis, etc. However, the spatial activation patterns by local signals in vivo remain unclear. In this study, we focused on Signal Transducers and Activators of Transcription (STAT) signalling in Sertoli cells, because STAT is a major crucial cytokine transducer for somatic cyst cell regulation in Drosophila testis niches...
February 2, 2018: Molecular Reproduction and Development
Yih-Sheng Yang, Jian Xie, Sung-Sen Yang, Shih-Hua Lin, Chou-Long Huang
The Na+-Cl- cotransporter (NCC) in distal convoluted tubule (DCT) plays important roles in renal NaCl reabsorption. Current hypothesis for the mechanism of regulation of NCC focuses on WNK4 and intracellular Cl- concentration ([Cl-]i). WNK kinases bind Cl- and Cl- binding decreases the catalytic activity. It is believed that hypokalemia under low K+ intake decreases [Cl-]i to activate WNK4, which thereby phosphorylates and stimulates NCC through activation of SPAK. However, increased NCC activity and apical NaCl entry would mitigate the fall in [Cl-]i...
January 31, 2018: American Journal of Physiology. Renal Physiology
Emilie Boscardin, Romain Perrier, Chloé Sergi, Marc P Maillard, Johannes Loffing, Dominique Loffing-Cueni, Robert Koesters, Bernard C Rossier, Edith Hummler
The amiloride-sensitive epithelial sodium channel (ENaC) and the thiazide-sensitive sodium chloride cotransporter (NCC) are key regulators of sodium and potassium and colocalize in the late distal convoluted tubule of the kidney. Loss of the α ENaC subunit leads to a perinatal lethal phenotype characterized by sodium loss and hyperkalemia resembling the human syndrome pseudohypoaldosteronism type 1 (PHA-I). In adulthood, inducible nephron-specific deletion of α ENaC in mice mimics the lethal phenotype observed in neonates, and as in humans, this phenotype is prevented by a high sodium (HNa+ )/low potassium (LK+ ) rescue diet...
March 2018: Journal of the American Society of Nephrology: JASN
Jenny van der Wijst, Omar A Z Tutakhel, Caro Bos, A H Jan Danser, Ewout J Hoorn, Joost G J Hoenderop, René J M Bindels
The distal convoluted tubule (DCT) of the kidney plays an important role in blood pressure regulation by modulating Na+ reabsorption via the Na+-Cl- cotransporter (NCC). A diet containing high salt (NaCl) and low K+ activates NCC, thereby causing Na+ retention and a rise in blood pressure. Since high blood pressure, hypertension, is associated with changes in serum calcium (Ca2+) and magnesium (Mg2+) levels, we hypothesized that dietary Na+ and K+ intake affects Ca2+ and Mg2+ transport in the DCT. Therefore, the present study aimed to investigate the effect of a high Na+/low K+ diet on renal Ca2+ and Mg2+ handling...
January 10, 2018: American Journal of Physiology. Renal Physiology
Yan Willière, Aljona Borschewski, Andreas Patzak, Tatiana Nikitina, Carsten Dittmayer, Anna L Daigeler, Markus Schuelke, Sebastian Bachmann, Kerim Mutig
Caveolin-1 (Cav1) is essential for the formation of caveolae. Little is known about their functional role in the kidney. We tested the hypothesis that caveolae modulate renal salt and water reabsorption. Wild-type (WT) and Cav1-deficient (Cav1-/-) mice were studied. Cav1 expression and caveolae formation were present in vascular cells, late distal convoluted tubule and principal connecting tubule and collecting duct cells of WT but not Cav1-/- kidneys. Urinary sodium excretion was increased by 94% and urine flow by 126% in Cav1-/- mice (p < 0...
January 11, 2018: Scientific Reports
Ming-Xiao Wang, Catherina A Cuevas, Xiao-Tong Su, Peng Wu, Zhong-Xiuzi Gao, Dao-Hong Lin, James A McCormick, Chao-Ling Yang, Wen-Hui Wang, David H Ellison
Kir4.1 in the distal convoluted tubule plays a key role in sensing plasma potassium and in modulating the thiazide-sensitive sodium-chloride cotransporter (NCC). Here we tested whether dietary potassium intake modulates Kir4.1 and whether this is essential for mediating the effect of potassium diet on NCC. High potassium intake inhibited the basolateral 40 pS potassium channel (a Kir4.1/5.1 heterotetramer) in the distal convoluted tubule, decreased basolateral potassium conductance, and depolarized the distal convoluted tubule membrane in Kcnj10flox/flox mice, herein referred to as control mice...
January 6, 2018: Kidney International
Qi Wu, Hanne B Moeller, Donté A Stevens, Rebekah Sanchez-Hodge, Gabrielle Childers, Marleen L A Kortenoeven, Lei Cheng, Lena L Rosenbaek, Carrie Rubel, Cam Patterson, Trairak Pisitkun, Jonathan C Schisler, Robert A Fenton
The importance of the kidney distal convoluted tubule (DCT) and cortical collecting duct (CCD) is highlighted by various water and electrolyte disorders that arise when the unique transport properties of these segments are disturbed. Despite this critical role, little is known about which proteins have a regulatory role in these cells and how these cells can be regulated by individual physiologic stimuli. By combining proteomics, bioinformatics, and cell biology approaches, we found that the E3 ubiquitin ligase CHIP is highly expressed throughout the collecting duct; is modulated in abundance by vasopressin; interacts with aquaporin-2 (AQP2), Hsp70, and Hsc70; and can directly ubiquitylate the water channel AQP2 in vitro shRNA knockdown of CHIP in CCD cells increased AQP2 protein t1/2 and reduced AQP2 ubiquitylation, resulting in greater levels of AQP2 and phosphorylated AQP2...
December 14, 2017: Journal of the American Society of Nephrology: JASN
Cary R Boyd-Shiwarski, Daniel J Shiwarski, Ankita Roy, Lubika J Nkashama, Hima N Namboodiri, Jian Xie, Kara L McClain, Allison Marciszyn, Thomas R Kleyman, Roderick J Tan, Donna B Stolz, Manojkumar A Puthenveedu, Chou-Long Huang, Arohan R Subramanya
With-No-Lysine (WNK) kinases coordinate volume and potassium homeostasis by regulating renal tubular electrolyte transport. In the distal convoluted tubule (DCT), potassium imbalance causes WNK signaling complexes to concentrate into large discrete foci, which we call "WNK bodies." Though these structures have been reported previously, the mechanisms that drive their assembly remain obscure. Here, we show that kidney-specific WNK1 (KS-WNK1), a truncated kinase-defective WNK1 isoform that is highly expressed in the DCT, is critical for WNK body formation...
December 13, 2017: Molecular Biology of the Cell
Robert Kleta, Detlef Bockenhauer
Renal tubulopathies provide insights into the inner workings of the kidney, yet also pose therapeutic challenges. Because of the central nature of sodium in tubular transport physiology, disorders of sodium handling may affect virtually all aspects of the homeostatic functions of the kidney. Yet, owing to the rarity of these disorders, little clinical evidence regarding treatment exists. Consequently, treatment can vary widely between individual physicians and centers and is based mainly on understanding of renal physiology, reported clinical observations, and individual experiences...
December 13, 2017: Journal of the American Society of Nephrology: JASN
Heba Al-Hussaini, Narayana Kilarkaje
Hyperglycemia induces the formation of advanced glycation end products (AGEs) and their receptors (RAGEs), which alter several intracellular signaling mechanisms leading to the onset and progression of diabetic nephropathy. The present study focused on, i) modulatory effects of trans-resveratrol (3,5,4'-trihydroxy-trans-stilbene) on structural changes, AGE (NƐ -carboxymethyl-lysine), RAGE, oxidative stress and DNA damage, and apoptosis, and ii) localization of fibrotic changes, AGE, RAGE, 8-oxo-dG and 4-hydroxynonenal (4-HNE) in diabetic rat kidneys...
January 15, 2018: Toxicology and Applied Pharmacology
I V Mil'to, I V Sukhodolo, V V Ivanova, M S Yusubov
The ultrastructure of nephrocytes of the proximal and distal convoluted tubules, podocytes, mesangial cells, and macrophages of the interstitial connective tissue was studied after single intravenous administration of magnetite nanoparticles modified with chitosan (magnetic nanospheres) or lipids (magnetic liposomes). Transmission electron microscopy showed ultrastructural features of absorption of magnetite nanoparticles. The shape, size, and number of vesicles containing nanoparticles in nephrocytes of convoluted tubules and macrophages after administration of the suspensions of magnetic nanospheres and magnetic liposomes were described...
December 2017: Bulletin of Experimental Biology and Medicine
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"